wlan: enable Low Power Heart Beat feature

Turn on build flag for LPHB feature.
Integrate FW shared common definition for compile.

Change-Id: Ic0ae56392595ccca77c392087b9bd2d4c87f02ef
CRs-fixed: 518667
diff --git a/Kbuild b/Kbuild
index 7179fa9..aebe984 100644
--- a/Kbuild
+++ b/Kbuild
@@ -525,7 +525,8 @@
 		-DWLAN_FEATURE_ROAM_SCAN_OFFLOAD \
 		-DWLAN_FEATURE_GTK_OFFLOAD \
 		-DWLAN_WAKEUP_EVENTS \
-	        -DWLAN_KD_READY_NOTIFIER
+	        -DWLAN_KD_READY_NOTIFIER \
+		-DFEATURE_WLAN_LPHB
 
 ifneq ($(CONFIG_PRONTO_WLAN),)
 CDEFINES += -DWCN_PRONTO